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That speed increase is impressive. I will try to provide a detailed code review within the next few days.

My apologies for the delay. The Github inline code review interface has not been working well, and I was hoping that with a few days and a forced refresh, it...

Homing weapons are a perpetual source of argument in the Descent community. @zicodxx reworked them after 0.58.1 to try to make them more like DOS. If you can present an...

Given that zico has reviewed this again in detail, and I'm not inclined to doubt his work, I think the only remaining thing that could be done here is if...

Rebirth had, and still has, a pure SDL renderer, which does not use OpenGL. This is a compile-time option, because choosing to use SDL-only instead of SDL-with-OpenGL changes many things...

There are currently 224 places in the code where the program is in some way built differently depending on whether the build is SDL-only or SDL-with-OpenGL. To enable runtime switching,...

I don't build anything. I just write the code. zico builds those and posts them as a courtesy to the community. zico worked on the project long before I did...

Object duplication is an advanced feature to enable anarchy to work well on levels that are otherwise too sparsely equipped. Use it wisely.

Well done. Would you be interested in writing this up and submitting a pull request to improve the documentation, so that other users can readily find how to do this?...

I think that would be fine. A short note in `INSTALL.markdown` could direct readers to the platform-specific instructions, in case they do not notice it in the directory listing.